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Which wire is negative on this PC fan? - Electrical Engineering Stack Exchange
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Amazon.com: MMOBIEL Laptop CPU Cooling Fan Replacement for HP 250 G4 255 G4 Notebook 15-AC Series DC28000GAR0 SPS-813946-001 - 4 Pin 4 Wire - Incl. (+) Screwdriver : Electronics
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:max_bytes(150000):strip_icc()/motherboardfanconnector-eae66d5ae30845fb907aa81c4c2dbc59.jpg "Motherboard Fan Connectors: What They Are and How They Work")
Motherboard Fan Connectors: What They Are and How They Work
PC Fan Wiring for Customized Use - Embedded Computing Design
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3 pin PC fan - Project Guidance - Arduino Forum
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